Nonheat-conducting covering



June 16,` 1925; n

' H. R. WARDELL NONHEAT coNDUcTING covERING Filed oct. 16, 1925 4f V Alhull V//A INVENTOR lilatented .lune i6, E925.

UITED STATES HENRY n. WARDELL, or NEW YORK, N. Y., AssIGNoR ToJoHNs-MANVILLE, moor;-

\ rom'rnn, A CORPORATION oF NEW YORK.

NONHEAT-CONDUCTING COVERING.

application led October 16, 1923. Serial No. 668,793.

To all whom t may. concern.'

Be it known that I, HENRY R. lWARDELL, a citizen of the United States ofAmerica, residing at New York city, in the county and State of New York,have invented certain new and usefullmprovements in Nonheat- ConductingCoverings, of which the following is a specification.

My invention relates tothe prevention or reduction of any undesiredtransfer of heat hy radiation or conduction, and comprises an improvedstructure which may he used as avcovering for pipes and other articleswhich' have heated surfaces, the loss of heat from which is to he keptat a minimum, or which havecool surfaces, the transmission of heat towhich is to be prevented as far as possible. Accordingly my inventionmay be used on steam pipes to reduce the loss of heat in the containedsteam, or on brine pipes to prevent the atmosphere from unduly warmingthe' artificially cooled liquid in said pipes.

'lhe object of the invention is to secure an eiicient covering of thiskind, i. e., one of low heat conductivity, which shall also be low incost. of manufacture as a result of the simplicity of itsconstructionand process of manufacture, and low in lirst cost of rawmaterials.

The best formof structure embodying my invention at present known to me,together with certain modifications thereof, are illustrated in theaccompanying sheet of drawings in which:

Fig. 1, is a detail plan view of a sheet of paper prepared for use in myinvention, parts being broken away.

Fig. 2, is a detail cross section of a sheet such as shown in Fig. 1,but shown on an exaggerated scale and in a somewhat diagrammatic manner.

' Fig'. 3, is a perspective view of a section of pipe covering in aprocess of manufacture employing thefpaper shown in Figs. l and 2.

Fig. 4, is a detail cross section of a portion of a structure such aswill be formed by piling up the sheets ofFigs. l and 2 with'intermediate unpe-rforated sheets between.

Figs. 5 and ,6 are viewssimilar to Figs. 1 and 2 but illustrating amodification, and Fig. 7 is' a detail cross section of a structureformed by superposing sheets such as are shown in Figs. 5 and 6.

Throughout the drawings like reference `characters indicate like parts.l representsa 'from the plane of the main sheet.

.'lhese'tahs or aps may he bent through angles of i8@ degrees asillustrated in Fig. 2, but it is only necessary that they he bent farlenough so that when subjected to compression along lines at rightangles to the plane of sheet l, they will not bend hack into holes ,if aseries of' such sheets as above described are superposed withinterspersed unperforated sheets 7, as indicated in Fig. al, a cellularmass will he formed containing a multitude of closed air spaces 8 formedby the holes 2, and others, 9, formed by the spacing away of proximateportions of an adjacent sheet 7, hy the talos 3, et' any particularperforated sheet l.. Such a huilt up mass can also be formed by rollinga perforated sheet l, and an unperforated sheet T, into a tube 6, asshown in Fig. 3. Such tube can then be further dealt with in the manperusual in making commercial pipe cover- 1n in forming a plurality of tabs3, around each opening or hole 2, as illustrated in Fig. l, (where theholes are shown square) it is advisablel to make the holes polygonal inshape, a tab heilig heut up from each side of the polygon, hut if onlyone tab or lap 5, is

yto be formed from each hole 4, as shown in ,Figs 5 and 6, the outlinesof the holes may lhe approximately circular, the sheet being uncut alonga small arc of each circle so thatthe cut portion forming the tab may hebent on that uncut portion as on a hinge.

Sheets having perforations with tabs outwardly bent therefrom of theform shown in Figs. 1 or 5, or otherwise, may he rolled up, or piled upto form a cellular mass without the use-of intermediate, orinterspersed, unperforated sheets 7, so long as the holes in adjacentsheets, or adjacent coils of the same sheet, are kept out of registerone with another. Such a cellular mass formed of sheets perforated asshown in Figs. 5 and 6 is illustrated in cross section in Fig. 7. lnsuch construction each hole 4 and thev space sui rounding itscorresponding tab, or flap 5, would form one closed cell.

While I prefer to use asbestos paper, or.

thin asbestos felt cut as shown in the drawings, and with the tabsYformed as described, as the main element of .my non-conductingcovering, it is obvious that sheets of other material might be used andthat the manner of forming and bending the tabs or flaps hereillustrated could be further modified so long as the Aprinciples ofoperation here outlined are retained.

In any case Where the underlying principles of my invention are employedthere Will be formed a body which is a poor conductor of heat bothbecause ot' the low conductivity of the material used and the greatnumber of closed air cells existing in said body,- air being a very goodheat insulator. The sheets of the type illustrated in Figs. l and 5, canbe rapidly and cheaply made by passing plain sheets o'f paper throughproper rolls, and the formation of the cylindrical pipe covering byWinding up such sheets on a Inandril is also a rapid, simple and cheapoperation. Consequently my invention produces an eiiicientnon-heat-conducting covering at a low cost.

Having described my invention I claim:

l. A non-heat-conducting covering Vcoinprising, in combination, aplurality of super-posed sheets of material of relatively low heatconductivity, which said sheets have a plurality oi' portions partlysevered from 'the main body to form a plurality of small tabs which arebent away from the planes of the sheets far enough to forni means ofspacing apart from said perforated sheets proximate portions of adjacentsheets.

2. A. non-heat conducting covering consisting of "the combination of aplurality of superposed sheets of material of relatively low heatconductivity, some of Which sheets have a plurality of portions partlysevered from the main body to form a multiplicity of small tabs whichare bent away from the planes of said sheets, While other sheetsinterspersed between those first mentioned are devoid of such tabformations, whereby a multiplicity ot' closed air cells are produced inthe structure so formed.

3, As an element in a structure for use as a non-heat conductingcovering, which structure is composed of a .multiplicity of superimposedsheets of material of relatively low heat conductivity and substantiallycri-extensive in relative positions, a sheet ot' material of thecharacter described having a plurality ot holes formed therethrough bypartial severance of small portions of the material from the main bodyot the sheet and the bending ot' such partially severed portions awayfrom the plane of the sheet, said holes being distributed withsubstantial uniformity throughout said sheet.

HENRY R. lVARDELL.

